Lisa becomes Bart's Little League coach in order to expand her extracurricular activities, but Bart comes to hate it when Lisa begins sucking the fun out of baseball.

!! Tropes:

* AwesomenessByAnalysis: Lisa's ease with numbers turns the team into a winning machine... at least at first.
* BoringYetPractical: Lisa uses math to lead the team to victory. Bart would rather be AwesomeButImpractical.
* BaitAndSwitchComment: A commentator said that, speaking of Homer, Lisa's father's name was... not in the list.
* CallBack: Marge recalls Mike Scioscia's radiation poisoning from ''[[Recap/TheSimpsonsS3E17HomerAtTheBat Homer at the Bat]]''. He has become super-smart and a saber metrics prodigy on the in-between.
* ControlFreak: Lisa becomes DrunkWithPower and devolves into this as the episode goes.
* GameOfNerds: Lisa is drawn to baseball by being introduced to Sabermetrics by Professor Frink.
* GenderBlenderName: When Bart accused Lisa of not understanding baseball, she brought up legendary baseball names of what she believed to be women (Terry Francona, Connie Mack). Nelson tells her those are men.
* KnowNothingKnowItAll: The aforementioned incident of Lisa claiming that women could coach baseball, using Terry Francona and Connie Mack as examples. Furthermore, as she brings wins to the team, she becomes more of a ControlFreak, to the point that she makes the team study phonebook-sized team tactic books right before starting every game and pretty complicated board drawings on training sessions. The fact that the team is winning is the ''only'' reason why none of them follow Bart into quitting.
* ShoutOut: The episode title (and some plot details) are a homage to ''Film/MoneyBall''.
* SpiritualAntithesis: After a fashion, to the earlier ''[[Recap/TheSimpsonsS18E18TheBoysOfBummer Boys Of Bummer]]''. On ''that'' episode, Bart losing a baseball game was the trigger to the whole town of Springfield to label him a loser and bully him into [[DrivenToSuicide suicidal depression]]. On ''this'' episode, Bart losing the game (after learning that withstanding the team manager even if (s)he's a {{Jerkass}} is worth it for the sake of winning (and keeping families together)) by nearly stealing a home run makes Lisa understand that it's the passion of the game that counts over becoming a winning-obsessed ControlFreak.
* TechnicianVersusPerformer: With Lisa on the "technician" spot (winning by the tactics analyzed thoroughly through Sabermetrics, anything that deviates from them is unacceptable) and Bart on the "performer" spot (the typical "win or lose, what you should have on the field is fun" Aesop).
* TenMinuteRetirement: Bart quitting the team at the end of the second act, only to return to the third after being told that winning is worth minor sacrifices, like withstanding a {{Jerkass}} leader.